I'm going to be upgrading my home tank from a 25 gallon to a 37 gallon in the next couple of months. Right now I have 6 tetras, 1 small plecostomus (2" but he's 3 years old, don't know if he'll grow much bigger) and 1 full grown red tail shark. All of these will be going into the new 37 gallon tank.
I'd like to add a fish or two that are bigger than the shark and are colorful. No one in the tank right now is really colorful. I was thinking of maybe a discus or two but think the 37 gallon may be too small for that.
Is the 37 gallon with the above mentioned residents too small to add a discus or two?
What, if not discus, would be a good new resident considering it would have to be peaceful, community ok, colorful and larger than the 4" shark.